John t



(No Model.) v J. T. OBENOI-IAIN.

GRINDING MILL.

Wlrzvz zissi I r L I .[NVENTOR ATTORNEY JOHN T. OBENOHAIN, OFLOGANSPORT, INDIANA.

GRENDENGHWILL.

SPECIFICATION forming part of Letters Patent No. 289,695, dated December 4, 1883. Application filed September 1.1853. (No model.)

To all whom it may concern-.-

Be it known that I, J OHN T. OBENOHAIN, of Logansport, Cass county, Indiana, have invented certain new and useful Improvements in Grinding-Mills, of which the following is a specification.

The invention relates to mills for grinding by means of a corrugated roll working in connection with fixed grinding agents. It relates, especially, to mills for use in flour-mills executing the gradual-reduction process.

The object of the invention is to provide a mill which will perform the work of several mills of common construction, and at the same time execute the process of gradual reduction.

The invention will be understood from the following description, taken in connection with the accompanying drawings, in which Figure 1 is a plan of a mill embodying my improvements, part of the top plate being broken away; Fig. 2, a side elevation of the same, parts being broken away; and Fig. 3, a view of the inner face of one of the grindingshoes.

In the drawings, A represents a grindingroll having a corrugated periphery; B, the top plate of the mill-frame; O, the bottom plate of the mill-frame; D, the shaft of the roll, running in suitable bearings and having a pulley; E, a concave or grinding-shoe, of which thereare four in the example illustrated, arranged in the frame at the edge of the roll; F, a funnelshaped channel or cavity in the face of the shoe, open at the top and face of the shoe; G, the corrugated grinding surface of the shoe; H, a screw attached to the shoe at its free edge, the shoe being pivoted and said screw projecting outside the case of the mill; I, a screw hand-wheel upon the projection of said screw; J, a helical spring upon the screw, between the shoe and the case of the mill, and tending to press the shoe toward the roll; K, a flat stretcher or, plate secured between the top and bottom plates of the millframe, there being one at each shoe, to serve as part of the mill frame and casing; L, casing-panels completing the circuit of the easing entirely aroundthe roll, which is thus entirely inclosed; M, studs by which the top and bottom plates of the mill-frame are secured to each other; N, the pivot-screws of the shoes; 0, flanges bolted to the top andbotof matter.

tom plates of the mill-frame at the shoes, to serve as receiving-bosses for the pivot-screws N, the bolts by which theflanges are secured to the plates being loose in the flanges, to permit slight shifting of the flanges; P, partitions connected with panels L and reaching inward to the roll, whereby the annular space between the roll and casing is divided up into as many compartments as there are shoes; Q, outlet-apertures in the bottom plate, there being one for each of the compartments; R, the discharge-spouts of said apertures; S, inletapertures in the top plate, communicating with the channels F in the shoes; and T, a lip or apron, of leather or other suitable material, secured to the edge of partition P where it approaches the roll.

The grinding is done between the roll and shoes. The springs hold the shoes to the roll with an elastic pressure. The hand-wheels serve to adjust the approach of the shoes to the roll. The adjustable flanges serve to permit the shifting of the shoe-pivots in bringing the shoes into fair relation to the roll. Matter entering the mill at an inlet S will enter the shoe-channel, be acted upon by the grinding roll and shoe, enter the compartment, and discharge at the spout belonging to the particular inlet; hence in the example illus trated four distinct grinding operations may be going on at once, and each of the four operations may be upon different kinds or qualities The shoes differ in the fineness of their corrugations, and hence while one of the operations above referred to reduces matter to a certain fineness, another of the operations may be yielding a finer product.

In executing "the gradual-reduction process with this machine the procedure may be as follows: Grain is fed to the coarsest shoe and the product passed to the chop grader. From the chop-grader the proper product goes to the next finer shoe, which in turn delivers its product to the second grader, which delivers to a still finer shoe, and so on as far as it is desirable to carry the process. One of these mills may be provided with, say, six shoes, each of differing fineness.

It will be noticed that the edge a of the shoe-channel, which channel is open at the face and top of the shoe, against which the roll motion urges the grain to the grinding, is

inclined. This inclination tends to lift the stantially as set forth, of a corrugated roll, a

series of corrugated grinding-shoes arranged around the roll, and an inclosing-case provided with an inlet and outlet and a separating-partition for each shoe.

2. In a grinding-mill, the combination, sub stantially as set forth, of a corrugated roll, a series of corrugated grinding-shoes, of differing fineness of corrugation, arranged around the roll, and an inclosing case provided with I an inlet and an outlet and a separating-partition for each shoe.

3. In a grinding-mill, the vertically-corrugated grinding-shoe E, with the feed-channel in its faceopen at the face and at one end, substantially as and for the purpose set forth.

4. In a grinding-mill, the vertically-corrugated grinding-shoe E, With the feed-channel in its face open at the face and at one end, and having the inclined edge, substantially as and for the purpose set forth.

5. In a rollermill, the combination, sub.- stantially as set forth, of the corrugated roll, the top and bottom plates of the mill-frame, the grinding-shoe pivoted thereto at the edge of the roll, and the adjustable pivot-flanges secured thereto.

JOHN T. OBENCHAIN.

Witnesses:

J. W. SEE, ISRAEL WVILLrAMs. 

